Process of making camphor.



UNITED STATES 1 PATENT OFFICE.

GHARLESGLASEB, oF BALTIMORE, MARYLAND...

Browse or MAKING csinrnon.

To all who'm it concern: I Be it known that 1, CHARLES GL'A s R, a citizen'of the United States of America, and a resident of the city of Baltimore, State oi'Maryland, have invented certain 5 new and useful Improvements in Processes of Making Oamphor, of which the following is a specification.

My invention relates to an improvement in making camph'or from camphene, borneol, isoborneol and other hydrocarbons and derivatives therefrom yielding camlO phor upon oxidation.

The following oxidizing agents have been described as yielding camphor when allowed to act on camphene,

isoborneol, borneol and allied bodies: chromic acid,

permanganates, hydrogen peroxid, nitric acid, gaseous .chlorin, and an aqueous solution of chlorin, ozone,

oxygen, and air.

v .I have discovered, that camphene slowly,.is'oborneo1 and borneol quite rapidly, may'be oxidized to camphor by heating same with a suflicient quantity of an aqueous solution of a bleaching powder or hypochlorite such as Ca(0Ol),,CaCl, with or without a catalyzer.

The best way to carry out the process, choosing isoaborneol as an example, is as follows: Place 100 parts isoborneol in a suitable vessel and add 100 to '120,parts of bleaching powder or equivalent or other hypochlorite dissolved in 2,400 parts water; apply heat by steam or Specification of Letters Patent. r

' a Applioition filed January 18, 1906, Aerial lio. 2,651.

I Patented Aug. 27, 1907.

otherwise. When the temperature has risen to near the boiling point of the liquid, camphor' in a pure form will distil from it and collect in the upper cooler portion of the vessel or in a suitable condensing chamber provided for the purpose of collecting it. The conversion is completed in a short time and isquantitative. The activity of the oxidation may be increased by the action of acatalyzing agent such as iron, cobalt and others.- The same results may be accomplished with cainphene and the other substances, but-at different rates of speed. This process is applicable to the conversion of camphene, isoborneol, borneol, or other camphor-yielding material into camphor, and therefore when I use the word isoborneol in the claims I mean it to be under- 40 stood that all. of the other camphor-yielding compounds may be substituted for isoborneol in my process. 

